WPCentral posted a story that Nokia has released an updated firmware for the Lumia 620

Those fixes include:

Improved touch screen functions, including corrections in multi-touch actions
Better voice quality with Bluetooth headsets that support echo/noise suppression
Enhanced camera performance with corrected exposure when flash is used in bright light conditions
Various improvements to system stability, performance, and usability

You can check to see if your Lumia 620 has the update waiting by going into Settings > Phone Update and Check for Updates. You will need to be over Wi-Fi to get it and it should take about 10-15 minutes to complete the process.

  Nokia Lumia 620 firmware rolling out globally, gets detailed in changelog